linux-kernel - Re: [RFC 0/2] srcu: Remove pre-flip memory barrier

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Message-ID: <20221222122404.GB44777@lothringen>
Date:   Thu, 22 Dec 2022 13:24:04 +0100
From:   Frederic Weisbecker <frederic@...nel.org>
To:     Boqun Feng <boqun.feng@...il.com>
Cc:     Joel Fernandes <joel@...lfernandes.org>,
        linux-kernel@...r.kernel.org,
        Josh Triplett <josh@...htriplett.org>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        "Paul E. McKenney" <paulmck@...nel.org>, rcu@...r.kernel.org,
        Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [RFC 0/2] srcu: Remove pre-flip memory barrier

On Thu, Dec 22, 2022 at 01:16:12PM +0100, Frederic Weisbecker wrote:
> On Wed, Dec 21, 2022 at 12:19:47PM -0800, Boqun Feng wrote:
> > On Wed, Dec 21, 2022 at 06:30:05PM +0100, Frederic Weisbecker wrote:
> > By "same effect" you mean removing E results in the exist-clause
> > triggered? If so, then our environments disagree with each other ;-)
> 
> Nope, removing D :-)
> 
> (And yeah probably I misread your previous mail and we weren't talking
> about the same thing...)

Yeah checking that again, I got confused in the discussion between my two
tests srcu-E and srcu-D. Anyway, you were right about the control dependency :)

> 
> Thanks.